辽北清原地区典型金矿地质特征、成因类型及成矿规律

    Geological characteristics, genetic types and metallogenic regularity of typical gold deposits in Qingyuan area of the northern Liaoning Province

    • 摘要: 辽北清原地区金矿资源丰富,但缺少对该地区金矿成因类型及成矿规律的系统论述。基于清原地区典型金矿的空间分布、赋矿层位、控矿构造、矿化蚀变及地球化学特征,总结金矿成矿规律。结果表明: 辽北清原地区金矿主要赋存于新太古界清原群石棚子组和红透山组,少数赋存于太古宙和中生代花岗质岩石中; 控矿构造主要为倒转向斜、断裂及太古宙花岗-绿岩地体内的韧性剪切带。同位素地球化学特征表明: 金矿的成矿流体具有海水、变质热液和岩浆热液3种来源; 成矿物质来源为深源岩浆或岩浆与地层的混合源; 矿床成因类型可分为火山成因块状硫化物(volcanic-associated massive sulfide,VMS)型、岩浆热液型和变质热液型。根据金矿控矿条件、成因类型、区域异常分布的特点,划分出3个Ⅳ级金成矿亚带、6个成矿远景区和2个成矿系列。研究成果可为辽北清原地区金矿找矿提供基础资料。

       

      Abstract: The gold resources in Qingyuan area of the northern Liaoning Province are abundant, but the genetic types and metallogenetic law of gold deposits in this area have not been systematically discussed. The spatial distribution, ore-bearing horizon, controlling structural types, mineralization alteration, and the isotope geochemical characteristics of typical gold deposits were collected to summarize the mineralization regularity of gold deposits. The results showed that gold deposits in Qingyuan area of the northern Liaoning Province mainly occurred in Shipengzi Formation and Hongtoushan Formation of Qingyuan Group, while a small amount of gold deposits occurred in Archean and Mesozoic granitic rock. The ore-controlling structures were mainly inverted syncline structure, fault structure and ductile shear zone in Archean granite-greenstone terrane. The isotope geochemical characteristics showed that the ore-forming fluids in Qingyuan area were derived from seawater, metamorphic hydrothermal and magmatic hydrothermal fluids, respectively. The ore-forming materials came from deep source magma or mixture of magma and strata. The genesis types of gold deposits could be divided into volcano-associated massive sulfide (VMS) type, magmatic hydrothermal type, and metamorphic hydrothermal type. Three Ⅳ gold sub-metallogenic belts, six mineralization prospect areas and two mineralization series have been delineated according to the controlling conditions, genesis types, and regional anomaly distribution characteristics. The study achievements could supply scientific and theoretical basis support for the gold exploration in the northern Liaoning Province.

       

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